Attach an external monitor. Does the external come on? May have to use the FN key + F8 to toggle it between the LCD and the attached monitor.
When you say that the laptop LCD glows a little bit, this makes me think the back light of the LCD has gone bad. If it displays fine on the external, then it is a pretty good chance the LCD back light has failed. If you can attach an external monitor and see something on it, run the built hardware test. This is done from a powered down state. Then press the FN key + Power, this places it into the diagnostic. Follow the on screen instructions. If it comes back with an error code, write this down and compare it to this list at Dell website. http://support.dell.com/support/topics/global.aspx/support/dsn/document?c=us&l=en&s=gen&docid=14B3819735D6B40EE0401E0A55177ED2
Occasionally, reseating the LCD video cable to the mother board will have a positive effect. Here is a link to the online service manual that explains how to reset it. In the diagram it is labeled #5 It is located under the keyboard.
My dell d630 laptop lcd light problem
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